GST/Tax Calculator
Add or remove GST and other taxes from amounts with detailed breakdowns.
Add GST/Tax
Calculate the final amount after adding GST or sales tax to a price.
How adding GST/tax works:
• Formula: Final Amount = Original Amount × (1 + Tax Rate/100)
• Example: $100 with 18% GST = $100 × (1 + 18/100) = $100 × 1.18 = $118
Remove GST/Tax
Extract the original amount and tax from a tax-inclusive price.
How removing GST/tax works:
• Formula: Original Amount = Final Amount ÷ (1 + Tax Rate/100)
• Example: $118 including 18% GST = $118 ÷ (1 + 18/100) = $118 ÷ 1.18 = $100
Multiple Items Calculator
Calculate GST/tax for multiple items at once.
| Item | Price (excl. tax) | Quantity | Tax Rate (%) | Action |
|---|---|---|---|---|
How the multiple items calculation works:
• Each item's tax is calculated separately based on its tax rate
• Subtotal is the sum of all items before tax
• Total tax is the sum of all calculated taxes
• Grand total is subtotal + total tax
GST/Tax Information
GST (Goods and Services Tax) is a value-added tax levied on most goods and services. Tax rates vary by country and type of goods or services.
Common GST/Tax Rates by Country
| Country | Standard Rate |
|---|---|
| Australia | 10% |
| Canada | 5% (GST) + PST |
| India | 5%, 12%, 18%, 28% |
| New Zealand | 15% |
| Singapore | 8% |
| UK (VAT) | 20% |
| EU (VAT) | 15% - 27% |
Tax Calculation Tips
- For business invoices, always specify whether prices are tax-inclusive or tax-exclusive.
- Check your local tax regulations for correct tax rates and exemptions that might apply.
- When comparing prices, make sure you're comparing tax-inclusive with tax-inclusive, or tax-exclusive with tax-exclusive.
- For international transactions, be aware of potential additional import duties or taxes.
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